US5807128A - Electrical connector - Google Patents

Electrical connector Download PDF

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Publication number
US5807128A
US5807128A US08/859,337 US85933797A US5807128A US 5807128 A US5807128 A US 5807128A US 85933797 A US85933797 A US 85933797A US 5807128 A US5807128 A US 5807128A
Authority
US
United States
Prior art keywords
latch
daughter board
electrical connector
levers
board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/859,337
Other languages
English (en)
Inventor
Tsuyoshi Sakata
Tatsuya Arai
Tsutomu Matsuo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hirose Electric Co Ltd
Original Assignee
Hirose Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hirose Electric Co Ltd filed Critical Hirose Electric Co Ltd
Priority to US08/859,337 priority Critical patent/US5807128A/en
Application granted granted Critical
Publication of US5807128A publication Critical patent/US5807128A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/82—Coupling devices connected with low or zero insertion force
    • H01R12/83—Coupling devices connected with low or zero insertion force connected with pivoting of printed circuits or like after insertion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/721—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures cooperating directly with the edge of the rigid printed circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/627—Snap or like fastening
    • H01R13/6271—Latching means integral with the housing

Definitions

  • the present invention relates to electrical connectors for connecting to a mother board a daughter board having a number of pads on an edge portion thereof in a direction vertical, parallel, or diagonal to the mother board.
  • Such zero insertion force connectors have latch levers with a latch portion erected on opposite sides of an open mouth in the insulation housing.
  • the front edge portion of a daughter board is inserted into the open mouth of the front insulation housing and then turned rearwardly about the edge.
  • the latch levers are flexed outwardly by the daughter board so that the opposite sides of the daughter board pass over the latch portions.
  • the latch levers then snap back so that the latch portions hold the respective sides of the daughter board. This complete the connection of the daughter board to the electrical connector.
  • the daughter board connected to the electrical connector is biased to turn forwardly by the contact terminals disposed in the open mouth of the insulation housing. To prevent this forward rotation, the latch portions of the latch levers hold the daughter board on the front surface of the opposite sides. Consequently, unless the latch levers are flexed outwardly, the daughter board cannot be removed from the electrical connector.
  • an electrical connector for connecting a daughter board with a plurality of pads on an edge portion thereof to a mother board, which includes an insulating housing to be mounted on the mother board; a plurality of contact terminals disposed in the insulating housing; an open mouth provided in the insulating housing for receiving and allowing the daughter board to be turned toward a latch position; the contact terminals arranged in the open mouth in a lengthwise direction of the open mouth; a pair of latch levers provided on opposite sides of the open mouth and having a latch portion and a sliding member at an upper portion thereof; a protective member provided on the insulation housing and spaced from the sliding member by a predetermined distance; a front surface of the latch portion being made in such a form that the daughter board can pass over the latch portions, with opposite sides thereof pushing the latch levers outwardly, when it is turned rearwardly about the edge portion; and a rear surface of the latch portion being made in such a form that it latches the daughter board to the electrical connector when the daughter board is connected to
  • the sliding members are sliding projections and the protective member are U-shaped structures to provide protective walls facing to the sliding members.
  • the sliding members are over flexure preventing projections and the protective members are second over flexure preventing projections between the first over flexure preventing projection and the daughter board.
  • the rear face of the patch portion is made up of upper and lower inclined surfaces having different angles, with the upper surface having an angle more obtuse than that of the lower surface.
  • FIG. 1 is a perspective view of part of an electrical connector according to an embodiment of the invention.
  • FIG. 2 is a perspective view of part of an insulation housing for the electrical connector
  • FIG. 3 is a side view of an upper portion of a latch lever provided in the insulation housing
  • FIG. 4 is a sectional view of the electrical connector mounted on a mother board, to which a daughter board is connected;
  • FIG. 5 is a top plan view of a latch portion of the electrical connector
  • FIG. 6 is a sectional view of the electrical connector wherein a large external force is applied to the daughter board so that the latch lever is flexed forwardly;
  • FIG. 7 is a top plan view of the latch portion when a large external force is applied to the daughter board to flex the latch lever forwardly;
  • FIG. 8 is a sectional view of the electrical connector wherein a very large external force is applied to the daughter board to release the latch;
  • FIG. 9 is a top plan view of the latch portion wherein a very large external force is applied to the daughter board to release the latch.
  • an electrical connector 20 includes an insulation housing 21 mounted on a mother board 10.
  • An open mouth 25 extends in the bottom of and in a lengthwise direction of the insulation housing 21.
  • a daughter board 30 having memory modules therein is inserted into the open mouth 25 in a diagonal direction and then turned to the right angles to the mother board.
  • a number of common pads 32 are arranged at regular intervals on the both sides of a front edge of the daughter board 30. These common pads 32 are electrically connected to various components, such as memories, on the daughter board 30 via conductor patterns (not shown). Such a daughter board is conventional and will not be described in detail.
  • a number of terminal receiving slots 26 are provided in front, bottom and rear walls of the mouth 25. These terminal receiving slots 26 are arranged at regular intervals that are equal to those of the pads 32. A number of contact terminals 40 are disposed in the respective terminal receiving slots 26.
  • a pair of latch levers 22 extend upwardly from opposite ends of the mouth 25 in the insulation housing 21 and have a latch portion 23 at the top.
  • a projection 24 is provided on a rear wall of the insulation housing 21 near the latch lever 22 for engagement with a hole 31 of the daughter board thereby preventing the daughter board 30 from escaping upwardly.
  • a front edge portion of the daughter board 30 is diagonally inserted into the mouth 25 and then turned rearwardly about the edge.
  • the opposite sides of the daughter board 30 push outwardly the cam faces of the latch portions 23 of the latch lever 22.
  • the engaging holes 31 engage the projections 24 while the latch levers 22 snap to hold the daughter board 30, thus completing connection of the daughter board 30 to the electrical connector 20 as shown in FIG. 1.
  • the latch levers 22 are flexed outwardly so that the daughter board 30 is turned forwardly over the latch portions 23 by spring forces of the contact terminals 40, thus permitting removal of the daughter board from the mouth 25.
  • latch levers 22 extend upwardly from opposite ends of the open mouth 25 in the insulation housing 21.
  • the latch levers 22 are integrally molded with the insulation housing 21 from a plastic material. Free ends of the latch levers 22 are flexible outwardly, with the joint between the latch levers and the bottom of the insulation housing 21 as a fulcrum.
  • a latch portion 23 extends inwardly from the upper inner surface of each latch lever 23.
  • An over flexure preventing projection 29 is provided behind the latch portion 23.
  • the front face of the latch portion 23 consists of two abutting surfaces 23A and 12B having different sloping angles with respect to the daughter board.
  • the rear face of the latch portion 23 consists of two abutting surfaces 23C and 23D having different sloping angles with respect to the daughter board.
  • the sloping angles of the abutting surfaces 23C and 23D are made more acute than those of the abutting surfaces 23A and 23B.
  • the angle of the abutting surface 23A is made more obtuse than that of the abutting surface 23B while the angle of the abutting surface 23C is made more obtuse than that of the abutting surface 23D.
  • the front surface 29A of the over flexure preventing projection 29 is inclined slightly.
  • a sliding projection 22A is provided on the upper front side of the latch lever 23.
  • a U-shaped member 28 is integrally molded with the insulation housing 21 so as to provide a protective wall 28A facing the sliding projection 22A which has a different sloping angle with respect to the major face of the latch lever 22. As shown in FIGS. 4 and 5, the protective wall 28A is inclined at an angle corresponding to that of the sliding projection 22A.
  • a projection 24 is provided on the inner rear face of the latch lever 22.
  • An over flexure preventing projection 27 is provided at a position corresponding to the over flexure preventing projection 29.
  • the rear face 27A of the over flexure preventing projection 27 is inclined slightly.
  • the front edge portion of the daughter board 30 is inserted in the open mouth 25 of the insulation housing 21 by sliding it along the inclined guiding edge 25A of the open mouth 25.
  • the distance between the upper contact points 41 and the lower contact points 44 of contact terminals 40 are made equal to or slightly larger than the thickness of the edge portion of the daughter board 30 so that there is almost no resistance to the daughter board 30 by the contact elements 40, permitting zero force insertion of the daughter board 30 in the open mouth 25.
  • the daughter board 30 When the front end of the daughter board 30 strikes the inclined surface 25B on the bottom of the open mouth 25, the daughter board 30 is turned rearwardly (to the left in FIG. 4) at a point between the daughter board the inclined surface 25B.
  • the daughter board 30 When the daughter board 30 is turned rearwardly against the spring forces of the flexed contact elements 40, the daughter board 30 abuts against the front surfaces 23A and 23B of the latch portion 23. Consequently, the latch levers 22 are flexed outwardly by the cam action of the inclined front surfaces 23A and 23B, permitting the daughter board 30 to pass over the latch portions 23.
  • the engaging holes 31 of the daughter board 30 engage with the projections 24 of the insulation housing 21 while the latch lever 22 snap the daughter board 30 as shown in FIGS. 4 and 5.
  • the daughter board 30 is latched to the electrical connector 20, with the lower end of the daughter board 30 resting on the flat surface 25C of the bottom of the open mouth 25 while the common pads 32 being held between the upper contact points 41 and the lower contact points 44 with a predetermined contact force resulting from the spring forces of the contact terminals 40.
  • the daughter board 30 Under the latched condition, the daughter board 30 is biased forwardly (to the right in FIG. 4) by the contact terminals 40. However, the daughter board 30 is held by the latch portions 23 and not turned forwardly. The inside angles of the inclined surfaces 23C and 23D of the latch portions 23 are made almost as large as right angles so that the latch levers 22 are not moved outwardly (a direction perpendicular to the sheet) by the daughter board 30 which is biased forwardly by the contact terminals 40.
  • the external force F is so large that the sliding projections 22A of the latch levers 22 and the inclined surface 29A of the over flexure preventing projection 29 are brought to such positions that they are very close to the protective walls 28A of the U-shaped member 28 and the inclined surface 27A of the over flexure preventing projections 27, respectively (see FIG. 7). Since the latch levers 22 are flexed only forwardly as shown by the arrow P1, the opposite sides of the daughter board 30 are held firmly by the rear surfaces 23D of the latch portions 23. Consequently, the opposite sides of the daughter board 30 do not pass over the latch portions 23 so that the daughter board 30 does not come off from the open mouth 25. When the external force is removed from the daughter board 30, the latch levers 22 return to the original latch positions as shown in FIGS. 4 and 5.
  • the daughter board 30 is moved forwardly.
  • the positions where the daughter board 30 is held by the latch levers 22 are moved from the rear surfaces 23D to the rear surfaces 23C as the daughter board 30 is turned forwardly.
  • the rear surfaces 23C are made less steep than the rear surfaces 23D, making it easier for the daughter board 30 to slide on the rear surface 23C, providing a cam action to push the latch levers 22 outwardly in the direction of arrow P2.
  • the opposite sides of the daughter board 30 readily pass over the latch portions 23 of the latch levers 22 by the cam action, so as to prevent the latch levers 22 from being flexed too much in a forward direction and broken or, otherwise, the latch portions 23 and/or the daughter board 30 from being broken.
  • the latch levers 22 return to the erected position while the daughter board 30 is ready to be removed from the open mouth 25 with zero removal force.
  • the front face of the latch portion 23 made up of two inclined surfaces 23A and 23B having different inclination angles and the rear face of the latch portion 23 made up of two inclined surfaces 23C and 23D having different inclination angles facilitate passing of the daughter board 30 over the latch portions 23 upon plugging on and off of the daughter board 30.
  • only one of the two combinations between (1) the sliding projections 22A and the protective wall 28A and (2) the inclined surface 29A of the over flexure preventive projection 29 and the inclined surface 27A of the over flexure preventing projections 27 may be employed.
  • the present invention is also applicable to electrical connectors by which a daughter board is connected to a mother board at an angle other than right angles.
  • a daughter board may be connected to a mother board in a parallel direction.
  • the latch structure it is possible to protect the latch condition if an external force is applied to the daughter board which has been latched to the electrical connector. If such an external force is excessive, the latch condition is released to let the excessive external force to go thereby preventing damage to the latch portions, the daughter board, and/or latch levers.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US08/859,337 1994-12-09 1997-05-20 Electrical connector Expired - Fee Related US5807128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/859,337 US5807128A (en) 1994-12-09 1997-05-20 Electrical connector

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP6-306238 1994-12-09
JP06306238A JP3078189B2 (ja) 1994-12-09 1994-12-09 電気コネクタ
US56124195A 1995-11-21 1995-11-21
US08/859,337 US5807128A (en) 1994-12-09 1997-05-20 Electrical connector

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US56124195A Continuation 1994-12-09 1995-11-21

Publications (1)

Publication Number Publication Date
US5807128A true US5807128A (en) 1998-09-15

Family

ID=17954667

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/859,337 Expired - Fee Related US5807128A (en) 1994-12-09 1997-05-20 Electrical connector

Country Status (5)

Country Link
US (1) US5807128A (zh)
JP (1) JP3078189B2 (zh)
KR (1) KR100352887B1 (zh)
CN (1) CN1042475C (zh)
TW (1) TW430191U (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6080000A (en) * 1996-03-18 2000-06-27 The Whitaker Corporation Cam-in edge-card connector
US20040152352A1 (en) * 2003-01-28 2004-08-05 Chou Hsuan Tsai Electrical connector capable of moving a circuit board in a reverse direction to an inserting direction by a distance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3730116B2 (ja) * 2000-12-21 2005-12-21 タイコエレクトロニクスアンプ株式会社 カードエッジコネクタ
KR100814771B1 (ko) 2006-03-23 2008-03-19 교우세라 에르코 가부시키가이샤 잠금구조
KR101074896B1 (ko) * 2009-04-30 2011-10-21 주식회사 연호전자 전기 커넥터
CN108871261A (zh) * 2018-07-23 2018-11-23 广州树熊文化传播有限公司 一种新型多面检测仪

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984996A (en) * 1989-07-10 1991-01-15 Amp Incorporated Printed circuit board edge connector
US4998890A (en) * 1990-07-05 1991-03-12 Kenny Tuan Stress-compensated contact element of electrical connector
US5064381A (en) * 1991-03-04 1991-11-12 Lin Yu Chuan Electric connecting device
US5147214A (en) * 1991-09-27 1992-09-15 Amp Incorporated Electrical terminal which has overstress protection
US5199895A (en) * 1992-02-04 1993-04-06 Chang Lien Ker Low insertion force, self-locking connecting apparatus for electrically connecting memory modules to a printed circuit board

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984996A (en) * 1989-07-10 1991-01-15 Amp Incorporated Printed circuit board edge connector
US4998890A (en) * 1990-07-05 1991-03-12 Kenny Tuan Stress-compensated contact element of electrical connector
US5064381A (en) * 1991-03-04 1991-11-12 Lin Yu Chuan Electric connecting device
US5147214A (en) * 1991-09-27 1992-09-15 Amp Incorporated Electrical terminal which has overstress protection
US5199895A (en) * 1992-02-04 1993-04-06 Chang Lien Ker Low insertion force, self-locking connecting apparatus for electrically connecting memory modules to a printed circuit board

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6080000A (en) * 1996-03-18 2000-06-27 The Whitaker Corporation Cam-in edge-card connector
US20040152352A1 (en) * 2003-01-28 2004-08-05 Chou Hsuan Tsai Electrical connector capable of moving a circuit board in a reverse direction to an inserting direction by a distance
US7059883B2 (en) * 2003-01-28 2006-06-13 Chou Hsuan Tsai Electrical connector capable of moving a circuit board in a reverse direction to an inserting direction by a distance

Also Published As

Publication number Publication date
JPH08162216A (ja) 1996-06-21
KR100352887B1 (ko) 2002-12-26
CN1042475C (zh) 1999-03-10
KR960027077A (ko) 1996-07-22
TW430191U (en) 2001-04-11
CN1124415A (zh) 1996-06-12
JP3078189B2 (ja) 2000-08-21

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